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How many factors affecting the size of rotating machines?

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How many factors affecting the size of rotating machines?

(a) 3

(b) 4

(c) 5

(d) 2

The question was posed to me in a job interview.

This interesting question is from Relation Between Rating, Dimensions, Variation of Output of Rotating Machines in portion General Concepts and Constraints in Design of Rotating Machines of Design of Electrical Machines

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Correct answer is (d) 2

For explanation: There are 2 factors that affect the size of rotating machines. They are speed of the machines and the output coefficient of the machines.

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